There are four amendments to the Constitution about who can vote. Which of the following is true?

The correct answer is B. Only citizens 18 and older can vote.

Explanation: The 26th Amendment to the U.S. Constitution specifically states that citizens who are 18 years of age or older cannot be denied the right to vote based on age. This amendment was ratified in 1971, establishing 18 as the minimum voting age. Other options mentioned in A, C, and D are not accurate as voting rights cannot be restricted based on tax payment, job status, or being 21 years old.